"the leg from the hip downwards," is used only of the breaking of the "legs" of the crucified malefactors, to hasten their death, John 19:31-33 (a customary act, not carried out in the case of Christ, in fullfillment of Exodus 12:46; Numbers 9:12 ). The practice was known as skelokopia (from kopto, "to stike"), or, in Latin, crurifragium (from crus, "a leg," and frango, "to break").
With over 3,400 entries, this timeless classic is THE reference guide to New Testament Greek words for English readers. It explains the meaning of the original Greek with the added dimension of the context of the Greek word.Wikipedia
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